Valve



Aug. 7, .1928.

J0 m a 1,679,370 5. J. NORDSTROM VALVE Filed A ril :50, 1927 ATTORNEYvalve except by those whose duty ing the meme Aug. 1,1928

UNITED STATES PATENT OFFICE.

EVEN JOEAN NOBDS'IBOI, Oi! OAKLAND, CALIFORNIA, ASSIGNOB T MERCO 'NOBD-BTBOM VALVE COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION 01'DELAWARE.

I VALVE.

Application flied April 80, 1827. Serial No. 187,729.

The invention relates to an improvement provement in plug valvesprovided with means for preventing manipulatlon or the it is to open andclose it.

lthas been proposed heretofore to provide valves with means to preventunauthorized persons from manipulating the valveseither to open or toclose them, and

to this .end valves have been provided with various kinds of lockingdevices. Some of these devices have proved effective and othersinefiect'ive. The efi'ective devices as heretofore constructed areobjectionable because of cost or because they have been found toocomplicated for general use. Qne object of thepresent invention is toprovide an improved valve having provision whereby the movablemember islocked aga1nst manipulation except by an operator provided with therequisite tool. Another ob ect of the invention is to produce a lugvalve withan improved an simplified ocking device which 18 eflic-ientand is cheaper to manufacture than those heretofore used or proposed. Tothese ends the invention consists in the improved valve her'elnafterdescribed and particularly pointed out in the appended claims.

In the accompanying drawingsillustratpreferred form of the invention,Fig. 1 1s a longitudinal section taken through the improved valve; Fig.2 1s a transverse section of the upper part of the valve shown in Fig.1; and ig. 3 1s a detail showing a pressure gun attached to the valve 1stem.

The locking device of the present invention, as illustrated in thedrawings, is embodied in a plu valve of the pressure lubri cated type,an is of such construction and arran ement that when the valve is closedthep u is held locked until an operator equippe with the proper kind oftool for lubricating the valve attaches the tool to the valve andoperates it, thereby actuating the locking device to unlock the plug andpermit. it to be turned to open pos t ons- The plug valve in which theimproved locking device of the presentinvention 1s embodled comprises acasing 5 havin' alongitudinal passageway 6 therethroug and a taperedvalve seat 7 formed transversely of the passageway 6. The valve seat 7is open at the upper and lower sides of the casing 5 and in the valveseat is located a taperedplug 8 having a hole 9 adapted to register withthe passageway 6, a valve stem 10 projecting through the upper side ofthe easing and a nut stem 11 projecting through the lower side of thecasing. The nut stem 11 is threaded to receive the nut 12, and aflexible ,washer 14 is interposed between the annular flange 15, formedon the underside of the casing, and the nut 12 whereby the plug 8 isresiliently held against the tapered valve seat 7. An anti-frictionwasher 16 is interposed between the bottom side of the resilient washer14 and the upper side of the nut 12. In order that the nut 12 may beheld against accidental displacement the lower end of the nut stem 11 isdrilled to receive a cotter pin 17, the outer ends of which are adaptedto be received in the slots 18 cut in the lower or outer side of the nut12.

- The lubricating system of the valve comprises four vertically arrangedlubricating grooves 20 formed in the valve seat 7 of the casing 5 andspaced substantially 90? apart.

The grooves 20 are each spaced substantially equi-distant from theadjacent side ofthe grooves 21 formed on opposite sides of the arger endof the plug 8. A corresponding pair of arcuate grooves 22 are formed onopposite sides 0 the smaller end of the pllif. The grooves 21 and 22 aresubstantia y 9 tively to the ho e the ends thereof bridge and therebyconnect the grooves 20 only when the plug is in substantially its closedand open ositione. The lubricant is fed into the lu ricating ooves 20,21 and 22 from a reservoir 24 ormed longitudinally in the valve stem 10and communicating at its inner end by the transverse hble25'in' thelarger end of the plug 8 with the cooperatin circumferential 0 in len hand are so located rela- 9 through the plug that 3 The lubricant in thegrooves 26 forms a seal which prevents leakage to the atmosphere and thelubricant is supplied from the:

10. Although the part 27 of the larger end of the plug lying between thegrooves 26 and the grooves 21 to form the vertical grooves or recesses28.

The lubricant is introduced into the reservoir 24 by a pressure gun 29,of usual construction, which is adapted to be attached to the fitting 30provided with the check valve 31, fixed in the outer end of the valvestem ressure gun 29 is described as of usual construction, it willpreferably be of a type not ordinarily found in household use.

The improved locking device for preventing the manipulation of the plug8 when 1t is supposed to remam in closed position, as shown in Fig. 1,comprises a bolt consisting of a head 32 and a shank 33. The head 32 ofthe bolt is slidinglyreceived in a bore 34.

in ahousing formed on the upper side of one end of the casing)o Theouter end of the shank 33 of the It Is slldm ly re-.

ceived in a guide consistin of a was er 36' threaded into the outer enof the bore 34. A coiled expansion sprin 37 loosely surrounding theshank 33of t e bolt and pressing at its inner-end against the outer faceof the head 32 and at its outer end a ainst the inner face of the ide 36yiel 'no'ly forces the bolt toward t eplu 8. A plug 38 closes the outerend of the ore 34 when the parts of the locking device have beenassembled.

When the bolt is in looking position, preventing rotation of the lug 8in the casing 5, the inner end of the ead 32 of the bolt is received inone of the recesses 28 and the outer end of the head 32 of the bolt isheld by the inner end of the bore 34. The lateral sides 41 of therecesses 28 areparallelly arran ed and the head 32 of the bolt is cylinrical. Consequently, turning the plug 8 by the shank 10 can not forcethe head 32 of the bolt out of a recess 28 against the action of thespring 37. The bolt can not be reached from the exterior of the valve topull the head 32 thereof out of a recess 28 in the plug because theguide 36 prevents a tool from being fastened on-the outer end of theshank 33 of the bolt, even though the plug 38 is removed. 7

Unlocking the valve to permit the valve plug 8 to be turned to openosition is accomplished by putting the lu ricant in the lubricatingsystem under pressure. This is done by attaching the pressure gun 29 tothe fitting 30 and operating the gun in the usual tem of the valve isunder premure the lubricant' which-enters the space between the innerface of the head 32 of the bolt and the adjacent part of the bottom ofthe recess passageway theret roug exerts its pressure to push the boltoutwardly against the action'of the spring 37, freeing the head 32 ofthe bolt from the sides 41 of the recess and permittingthe plug 8 to beturned by applying a wrench to the valve stem 10. In practice, however,the plug 8 will be turned during the manipulation of the pressure' gunby the operator. The mouth or nozzle of the un fits over the device 30and the threads 1n the nozzle of the gun engage with the threads 43 onthe device 30. As the operator turns the handle of the pressure gun tolforce the lubricant out of the gun and into E1118 lubricating system ofthe valve, the tur 'ng force exerted on the handle of the gun will besufiicient to turn the gun and valve lug 8 immediately the head 32 ofthe bolt is-forced out of the recess 28. To lock the valve it is simplynecessary to turn the plug 8 in reverse direction from open position toclosed position, or the plug 8 ma tion until the ot er recess 28 isbrought opposite the head 32 of the bolt Having thus described theinvention what I claim as new is I 1. A valve com rising a casihg havina and a-tapered plug seat formed transverse y of the passageway atapered plug seated in the plug seat and having a hole adapted toregister with the passageway, a cylindrical bolt slidingly mounted inthe casing, means for yieldingly pressing the bolt toward the plug, arecess in the lug adapted to receive the mner end of the bolt to lockthe plug in the casing, a lubricant reservoir in the plug communicatingwith the recess, and means for putting the lubricant under pressure tocause the lubricant to act a ainst the inner end of the bolt and therebyorce it out of the recess to permit the plug to be turned.

2. A valve com risin a casing havin a pass?eway theret roug and atapered plug seat ormed transverse y of the passageway, a tapered plugseated in the lug seat and having a hole adapted to register with thepassageway, a bolt slidingly mounted in the casing, a recess in the pluadapted to receive the inner end of the b0 t to hold the plug againstmovement in the casing, means in the plug communicating with the recessfor containing fluid substance, and means for putting pressure on thefluid substance to act against the mner end of the bolt and therebyforce the bolt out of the recess to permit the plug to be moved.

3. A valve OOIngfiSlIlifl casing having a passageway theret roug a plugseated in the casing and having a hole adapted to re ister with thepassageway, a bolt movab y mounted in the casing, a recess in the pluadapted toreceive the inner end of the bo t to hold the plug againstmovement means in the plug for containing fluid substance,

be turned in one direcand means for putting the fluid substance underpressure to force the bolt out of the recess to permit the plug to bemoved.

4. A valve com risin a casin havin a passageway theret rougfl, a move.le mem r mounted in the casing to control the passageway, a bolt movablymounted in the casing and having its inner end received in a recess inthe movable member to prevent movement ofthe movable member in thecasing, means communicating with the recess for containing fluidsubstance, and means for putting the fluid substance under pressure toforce the bolt out of the recess to permit the movable member to bemoved.

5. A valve comprisin a. stationary member and a movable mem r, a boltmovably supported in one of the members, one end of the bolt beingadapted to be received in a recess in the other member to hold the twomembers a ainst relative movement, means for containm a fluid substancecommunieating with t e recess in which the end of the bolt is received,and'mea-ns for putting the fluid substance under pressure to force thebolt out of the recess to permit the movable member to move relativelyto the stationary member.

' SVEN'JOHAN NORDSTROM.

